Selectable-Frequency Wireless Power Transfer for Multi-Protocol Charging
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Solution Overview
Problem
The increasing popularity of cellular telephone use has led to compatibility challenges among different wireless charging protocols, hindering consumer adoption of wireless charging due to issues with electromagnetic compatibility, interoperability with various smartphone manufacturers, and thermal requirements in automotive in-car wireless charging systems.
Innovation Solution
A wireless power transfer system with a selectable transfer function, including a filter and resonant tank circuit, configured with switchable components to optimize frequency and phase responses for multiple operating frequencies, ensuring compatibility with various wireless power standards and receiver requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed frequency wireless power transfer system is used, then the system design is simple, but it is incompatible with different wireless charging protocols and standards
Solution Approach 1:
The patent implements a dynamically reconfigurable resonant tank circuit that can switch between different frequency responses based on the detected wireless charging protocol. The circuit uses switchable capacitors and inductors to adjust the resonant frequency and impedance characteristics, allowing the system to adapt to Qi, AirFuel, and other standards without requiring multiple fixed-frequency systems.
Solution Approach 2:
The system changes key electrical parameters including resonant frequency, impedance, and quality factor by reconfiguring the resonant tank circuit components. This allows the wireless power transfer system to match the specific frequency and impedance requirements of different charging standards and receiver devices, resolving the compatibility issue while maintaining a single unified system design.
2Adaptability or versatility
If multiple fixed frequency systems are implemented for different protocols, then compatibility with various standards is achieved, but the device complexity and cost increase
Solution Approach 1:
The patent creates a universal wireless charging system where a single resonant tank circuit can serve multiple functions by reconfiguring its components. The same circuit hardware supports Qi, AirFuel, and other wireless charging standards through software-controlled reconfiguration, eliminating the need for multiple separate charging systems and reducing overall device complexity.
Solution Approach 2:
The system uses dynamic reconfiguration of the resonant tank circuit to replace multiple static systems. By detecting the target device type and protocol, the system switches capacitor and inductor configurations to match the required frequency and impedance characteristics, achieving multi-protocol support within a single unified hardware platform.
3Productivity
If the resonant tank circuit is optimized for a single frequency, then the power transfer efficiency is high, but the system cannot meet thermal requirements across different operating conditions
Solution Approach 1:
The system dynamically adjusts the resonant frequency and impedance parameters of the tank circuit based on operating conditions, load requirements, and thermal state. This allows the system to maintain optimal power transfer efficiency across different frequencies while also managing thermal characteristics, as different frequency configurations produce different heating patterns and efficiency profiles.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system enables seamless interoperability with different smartphone manufacturers and wireless power standards, addressing electromagnetic compatibility and thermal requirements, thereby enhancing the efficiency and compatibility of automotive in-car wireless charging.
Implementation Method 1
a resonant tank circuit coupled to a transmitter. The resonant tank circuit can include a capacitor and an inductor
Implementation Method 2
Wireless charging, on the other hand, entails device positioning to establish inductive power transfer
Implementation Method 3
A filter can have a selectable transfer function. The selectable transfer function can include selection of a frequency response
Implementation Method 4
one or more switchable components such that the circuit is configurable into multiple different configurations
Implementation Method 5
selecting a frequency response, selection of a phase response, or selection of both the frequency response and the phase response
Data Source
AI summary
A circuit includes an inverter, a filter, and a resonant tank circuit. The inverter converts direct current into alternating current. Attached to the inverter is the filter, which includes a first switched reactive component with two modes. Each mode offers distinct frequency responses and phase shift functions, and differing cut-off frequencies. The resonant tank circuit, connected to the filter's output, includes a tank inductor that facilitates the wireless transfer of electrical energy through a magnetic field.